MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Two features of the tRNA molecule associated, in converting the triplet codon to an amino acid, are |
| A. | in the T Loop and D stem and loop |
| B. | in the anticodon loop and D stem loop |
| C. | in the anticodon loop and the 3' CCA end |
| D. | none of the above |
| Answer» D. none of the above | |
| 2. |
Which of the following is the smallest of the RNAs? |
| A. | Messenger RNA |
| B. | Transfer RNAs |
| C. | Ribosomal RNAs |
| D. | All of these |
| Answer» C. Ribosomal RNAs | |
| 3. |
The mRNA from which of the following would contain a poly-A tail? |
| A. | A restriction endonuclease from |
| B. | <i>E. coli</i> |
| C. | Bacterial alpha-amylase |
| D. | Human insulin |
| E. | Bacteriophage DNA ligase |
| Answer» D. Human insulin | |
| 4. |
What is the average size (in bp) of a mature t-RNA? |
| A. | 80 bp |
| B. | 100 bp |
| C. | 120 bp |
| D. | 140 bp |
| Answer» B. 100 bp | |
| 5. |
RNA instability in alkaline solutions is due to |
| A. | adenine |
| B. | ribose |
| C. | uracil |
| D. | single strand nature |
| Answer» C. uracil | |
| 6. |
What modified base is at the 5' extremity of a capped eukaryotic m-RNA? |
| A. | 1-methyl-adenosine |
| B. | 2'-O-methyl-guanosine |
| C. | 7-methyl-guanosine |
| D. | 1-methyl-guanosine |
| Answer» D. 1-methyl-guanosine | |
| 7. |
What is the function of messenger RNA? |
| A. | It carries amino acids |
| B. | It is a component of the ribosomes |
| C. | It is a direct copy of a gene |
| D. | It is the genetic material of some organisms |
| Answer» D. It is the genetic material of some organisms | |
| 8. |
During RNA synthesis, the DNA template sequence 5'Tp Ap Gp Cp 3' Would be transcribed to produce which of the following RNA sequence? |
| A. | 5'-Ap Tp Cp Gp-3' |
| B. | 5'-Gp Cp Up Ap-3' |
| C. | 5'-Gp Cp Tp Ap-3' |
| D. | 5'-Ap Up Cp Gp-3' |
| Answer» C. 5'-Gp Cp Tp Ap-3' | |
| 9. |
Retroviruses replicate via __________ intermediate |
| A. | RNA |
| B. | DNA |
| C. | mRNA |
| D. | rDNA |
| Answer» C. mRNA | |
| 10. |
The genetic material of retroviruses such as HIV is |
| A. | DNA |
| B. | RNA |
| C. | protein |
| D. | all of these |
| Answer» C. protein | |
| 11. |
The tertiary structure of yeast tRNA |
| A. | involves extensive base stacking interactions |
| B. | resembles the 3-dimensional structure of other tRNAs |
| C. | is maintained mostly by non-Watson-Crick base pairing |
| D. | all of the above |
| Answer» E. | |
| 12. |
A nicked RNA molecule can be ligated by |
| A. | T4 RNA ligase |
| B. | DNA polymerase |
| C. | T4 DNA ligase |
| D. | all of these |
| Answer» D. all of these | |
| 13. |
Which of following RNA characteristically contains unusual purines and pyrimidmes? |
| A. | rRNA |
| B. | nRNA |
| C. | mRNA |
| D. | tRNA |
| Answer» E. | |
| 14. |
The anticodon is a structure on |
| A. | mRNA. |
| B. | tRNA. |
| C. | aribosome. |
| D. | rRNA. |
| Answer» C. aribosome. | |
| 15. |
In RNA, uracil pairs with |
| A. | adenine |
| B. | cytosine |
| C. | thymine |
| D. | guanine |
| Answer» B. cytosine | |